GPS Attitude Determine Performance Evaluation Using Ground Test Data

Gary Semar, Susan Gomez and James Carpenter

Abstract:	The International Space Station Alpha (ISSA) is planning to use GPS to provide position, velocity, time, and attitude information. In order to evaluate the error sources and expected accuracies associated with using GPS for attitude determination, NASA-JSC has conducted static and dynamic ground tests. Both the static and dynamic tests had a truth reference attitude that was at least ten times more accurate than GPS. The receivers tested were the TANS Quadrex and the TANS Vector. The Quadrex data was processed using a Kahnan Filter written by NASA, and the output was compared to the reference attitude. The TANS Vector’s attitude solution was also compared to the reference attitude. The results were consistent with what was expected for the chosen antenna array and the multipath environment. Multipath, line bias calibration, and phase center calibration were the most significant error sources and are a concern for the ISSA’s GPS system. Techniques for compensating for multipath and line biases were investigated.
Published in:	Proceedings of the 1995 National Technical Meeting of The Institute of Navigation January 18 - 20, 1995 Disneyland Hotel Anaheim, CA
Pages:	793 - 802
Cite this article:	Semar, Gary, Gomez, Susan, Carpenter, James, "GPS Attitude Determine Performance Evaluation Using Ground Test Data," Proceedings of the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1995, pp. 793-802.
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